Extend Opportunity BO with a new table view(0:n relationship)

Hello,

I'm looking to extend the Opportunity BO with new custom table with 0..n relationship with the header. I could only see guides and tutorials related to field extensions, but couldn't find anything related to table extensions. My requirement is somewhat similar to this post below http://scn.sap.com/thread/3467636

So, I wanted to know if there is a way out in the latest 1405 release on how to achieve this ? Is the Embedded Component and Multiple Web Services the only way to achieve table extensions with opportunity ?

Regards,

Srikanth